US2927034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of regenerated cellulose sponge material
Assignee: General Mills Inc
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Filing: 1956-10-25
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Granted: 1960-03-01
•
Expires: 1976-10-25
Abstract
No abstract record available.
Inventors
- 👤 Chih Chen Ming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:53
CPC Classifications
C; C08; C08J; C08J9/00; C08J2301/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE PROCESS OF PRODUCING A REGENERATED CELLULOSE SPONGE WHICH COMPRISES PREPARING A SOLUTION OF CELLULOSE SELECTED FROM THE GROUP CONSISTING OF VISCOSE AND CUPRAMMONIUM CELLULOSE, FOAMING SAID SOLUTION INTO A POROUS STRUCTURE AND THEN REGENERATING SAID CELLULOSE SOLUTION IN THE PRESENCE OF AN EXCESS OF ALKALI AND A REGENERATION ACCELERATING COMPOUND HAVING AS FUNCTIONAL GROUPS AT LEAST ONE HALOGEN ATOM AND AT LEAST ONE HYDROXYL GROUP IN WHICH ONE FUNCTIONAL GROUP IS SO LOCATED AS TO ACTIVATE THE OTHER FUNCTIONAL GROUP.
Claim 2
Dependent Claim
81 words
THE PROCESS OF PRODUCING A REGENERATED CELLULOSE SPONGE WHICH COMPRISES PREPARING A SOLUTION OF CELLULOSE SELECTED FROM THE GROUP CONSISTING OF VISCOSE AND CUPRAMMONIUM CELLULOSE, FOAMING SAID SOLUTION INTO A POROUS STRUCTURE AND THEN REGENERATING SAID CELLULOSE SOLUTION IN THE PRESENCE OF AN EXCESS OF ALKALI AND A REGENERATION ACCELERATING COMPOUND HAVING AS FUNCTIONAL GROUPS AT LEAST ONE HALOGEN ATOM AND AT LEAST ONE HYDROXYL GROUP IN WHICH ONE FUNCTIONAL GROUP IS SO LOCATED AS TO ACTIVATE THE OTHER FUNCTIONAL GROUP.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |